Dual Nucleophilic Catalysis with DABCO for the N-Methylation of Indoles
作者:Wen-Chung Shieh、Steven Dell、Andrew Bach、Oljan Repič、Thomas J. Blacklock
DOI:10.1021/jo0266644
日期:2003.3.1
DABCO is an extremely active catalyst for the methylation of indoles in conjunction with dimethyl carbonate (DMC). This green chemistry is highly effective and produces N-methylindoles in nearly quantitative yields. The reaction sequence consists of competing alkylation and acylation pathways and involves 1,4-diazabicyclo [2.2.2] octane (DABCO) dually as a nucleophilic catalyst, ultimately resulting in a single product: the N-methylated indole.